How to Make Cheap Throwing Spike

Throwing spikes

simple tools need for work
hammer, file, polish paper
a last resort when there is no tool for concrete may be pricked

again found material
form by itself
perfectly suited for the purpose
toss to take care of six rebounds

the tip is forged in fire
grinding and polishing the inevitable
10, 500, 2000, abrasive grain size

surprisingly effective
also have some experience
  its destination can be delivered